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What is the minimum tread depth for tires on axles other than the steering axle?
- A.No minimum applies off the steering axle
- B.6/32 inch
- C.4/32 inch
- D.2/32 inch in every major tread groove
Correct answer
D. 2/32 inch in every major tread groove
Why
Non-steering tires are held to 2/32 inch, half the steering-axle requirement, because they contribute less to directional control. A tire worn to the wear bars in a major groove is out of compliance even if other grooves still show tread.
Manual topic: Tires - Tread Depth · From the General Knowledge practice bank (GK-216).